Volume 1 TriStar Sudoku Puzzle Book Series by TriStar Books. This book contains four levels of difficulty. If you are new to Sudoku you can build up to the extra difficult puzzles 72 beginner or novice Sudoku puzzles, 48 intermediate puzzles, 48 difficult Sudoku puzzles and 48 extra difficult Sudoku puzzles. It's a great combination for all the family to have a try at solving Sudoku. Get your family involved for even more Sudoku fun
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